Making Korean Glass Noodle Stir Fry is a straightforward process if you follow these simple steps:

1. Cook the Glass Noodles: Boil water in a pot. Cook the glass noodles according to package instructions, typically for about 6-8 minutes. Drain and set aside.
2. Prepare the Vegetables: While the noodles are cooking, slice and prepare all the vegetables.
3. Heat the Oil: In a large skillet, heat vegetable oil over medium heat.
4. Sauté Onion and Garlic: Add the sliced onion and minced garlic to the skillet. Sauté for about 2 minutes until fragrant.
5. Add Carrots and Bell Pepper: Toss in the julienned carrots and sliced bell pepper. Cook for another 3-4 minutes until the vegetables start to soften.
6. Incorporate Spinach: Add fresh spinach to the skillet. Stir until wilted, about 1-2 minutes.
7. Combine Noodles: Add the cooked glass noodles to the skillet with the vegetables.
8. Season the Dish: Drizzle soy sauce, sesame oil, and optional sugar over the noodles and vegetables. Stir well to combine everything evenly.
9. Add Green Onions: Mix in the chopped green onions, and season with salt and pepper to taste. Stir-fry for another 1-2 minutes.
10. Garnish: Remove from heat and garnish with sesame seeds if desired.

This simple method will guide you in preparing a delicious Korean Glass Noodle Stir Fry with ease.